129690225 has 72 divisors (see below), whose sum is σ = 269655360. Its totient is φ = 58354560.

The previous prime is 129690221. The next prime is 129690251. The reversal of 129690225 is 522096921.

It is a happy number.

It is not a de Polignac number, because 129690225 - 2² = 129690221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129690225.

It is not an unprimeable number, because it can be changed into a prime (129690221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 104911 + ... + 106139.

Almost surely, 2^129690225 is an apocalyptic number.

129690225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129690225 is an abundant number, since it is smaller than the sum of its proper divisors (139965135).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129690225 is a wasteful number, since it uses less digits than its factorization.

129690225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 129690225 is about 11388.1616163453. The cubic root of 129690225 is about 506.1770082236.

The spelling of 129690225 in words is "one hundred twenty-nine million, six hundred ninety thousand, two hundred twenty-five".